JP2001293859A - Method for sticking ink jet print with alkaline paste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of ink jet print for cloth typically employing a small quantity variety production system that a variety of kinds of cloth must be dealt with, and to develop a dyeing method in which a variety of kinds of cloth can be pretreated or stuck conveniently in a factory having an ink jet printer. SOLUTION: A reactive dye sticks even under normal temperature when it is applied to a cloth and dried and then left as it is while being applied with alkaline liquid. This properties are applied to ink jet print and a sticking means requiring no steaming is obtained. In this method, an anti-stain alkaline paste is screen printed or sprayed onto the cloth before and after ink jet printing and left as it is for sticking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dyeing reactive dyes for ink jet printing, which can be applied to a wide variety of fabrics.

[0002]

2. Description of the Related Art At present, inkjet printing using a reactive dye is used for fibers such as cellulose and silk, and dyeing is performed in the following steps. (1) Pretreatment (2) Printing (3) Steam treatment (4) Soaping Ink-jet fabrics are designed to prevent "bleeding" at the time of printing, and at the same time become alkaline during steaming treatment to fix the dye. The main body of the practical machine is one to which glue containing sodium hydrogen carbonate is attached. Thus, the pre-treatment is integrated with the steam heat treatment.

Further, as a method not relying on steaming heat treatment, an alkali shock method and an alkali cold fix method in which an alkali solution is adhered after printing are described.

[0004]

Ink-jet printing is a typical multi-product, small-lot production system, and it is necessary to correspond to many types of fabrics. Some of them are three-dimensional fabrics having large irregularities. Since the types of pre-processed fabrics are limited, pre-processing must be performed according to the order. Pre-processing and steaming heat treatment of the target dough requires expensive processing equipment and steaming machines, and the productivity of the processing is high. In addition, sewing products and piece objects are difficult to pre-process. On the other hand, ink jet printing can produce extremely sophisticated prints, but is a print processing method with low productivity, and has a problem that productivity does not match with pre-processing. For this reason, outsourcing is often a factor in high costs. In particular, since the flatbed type is a batch type, pretreatment is more difficult, and a unique pretreatment and fixing treatment are required. The challenge is to develop a dyeing method that can easily perform pretreatment and fixation at a factory that has an inkjet printer.

[0005]

The alkali cold fix method is one of the methods for fixing a reactive dye. The reactive dye is a technique utilizing the fact that the dye adheres to the fabric even at room temperature, and is dried and then fixed by adding an alkaline liquid and leaving it to stand. In order to fix ink jet prints industrially by this method,
This requires a winding device and an adhesion device, and cannot be said to be a simple method. Although the alkaline solution is applied with a brush by a craft technique, it is inefficient for industrial production and cannot be used. In order to realize simple pretreatment and fixation, (1) an alkali paste obtained by adding a printing paste to an alkali solution was used as a means for preventing "bleeding" and promoting fixation. (2) Alkali adhesion means was screen printed with alkali glue on ordinary cloth, and sprayed on three-dimensional cloth. (3) The fabric was printed or sprayed with an alkaline paste before and after the ink-jet printing, and was fixed by standing. By the above-mentioned method, alkali fixation can be performed on the ink jet print at room temperature, and a clear dyed product is obtained. The present invention has solved the problem by a method in which fixing is performed in a similar process using alkali paste printing or alkali paste spraying as a pretreatment.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present method is characterized in that it is a simple method that can be fixed without performing steaming heat treatment. (1) After the alkaline paste is attached to the fabric, the fabric is dried. (2) Print with an inkjet printer. (3) Attach alkali glue. (4) Leave for 10 minutes or more (fixing time). (5) Perform soaping. This is a method of dyeing in the above steps.

The alkali paste is prepared by mixing potassium carbonate, sodium carbonate, sodium hydroxide and a printing paste, and adjusting the viscosity so that screen printing or spraying can be performed, thereby obtaining an alkali paste (pH 12 to 14). It is also desirable that the printing paste does not react with the reactive dye and is stable to strong alkali. Sodium alginate and highly etherified cellulose derivatives used for printing reactive dyes are representatives of glues that do not react with reactive dyes. The highly etherified cellulose derivative is stable to alkalis and can be used as a storage paste whenever necessary. On the other hand, the alkali stability of sodium alginate cannot be said to be good, and the glue containing sodium hydroxide decreases in viscosity with the passage of time. In addition, processed starch is superior in stability of alkali paste, and some pastes have low reactivity with reactive dyes, and can be used as storage paste when needed. Formulation examples are shown below.

In the screen printing method, a target cloth is screen-printed on a printing stand with the above-mentioned alkali paste.
After drying, the pattern is printed by inkjet printing. After drying, the alkaline paste is printed again on the printing stand. 10
Leave for more than a minute and allow to set. If the fixing time is too short, the color development becomes unstable. Therefore, the hue and the density are more stable when left for one hour or more and fixed. Furthermore, a fixing time of 1 to 2 hours is realistic considering productivity. In the post-treatment, a general post-treatment of reactive dyeing is performed. That is, the paste is sufficiently removed by washing with water, neutralized with an acid, and then soaped with hot water (70 ° C to 95 ° C) containing a surfactant.

Here, screen printing such as a three-dimensional cloth may not be suitable. For these fabrics, a spraying method is used. The spraying of the alkali paste is performed using a hand sprayer, a sprayer with a compressor, or a compressed gas cylinder.

[0009] In these steps, twice printing of alkali paste or spraying of alkali paste before and after printing makes it possible to carry out clear and sufficient density ink jet printing. Alkaline paste printing (drying) → If soaping is performed only by printing, most of the dyes fall off and do not adhere. Moisture is required for fixing, and the water content of the dye alone is not sufficient. When printed in a moderately dry (semi-dried) state, bleeding is small and fixation proceeds, but it is difficult to make the whole fabric the same water without unevenness. It does not become. On the other hand, in the case of printing with an alkaline paste after printing, Example 3 was used.
As shown by, depending on the fabric, printing, coloring and fixation are good, and it can be used alone. However, when compared with those obtained by printing with an alkali paste before and after printing, the print is inferior in sharpness, color development and density.

The present invention is a method which can be applied to roll-type ink jet printing, but requires a long printing stand suitable for fabric. On the other hand, the flatbed type ink jet print is mainly made of pieces or products, and may be a printing stand corresponding to the size of the ink jet bed. Further, as shown in the first, second and fourth embodiments, the cloth can be stretched on a board and moved, thereby preventing contamination and improving the productivity.

The present invention is a method suitable for performing ink jet printing on a part as in the second embodiment. For this reason, it can be used in combination with dip dyeing, uneven dyeing, dyeing dyeing, pattern dyeing, spray dyeing, transfer dyeing, injection dyeing, etc., and can improve low productivity and high cost which are the biggest problems of inkjet printing processing. In addition, it is possible to produce a product utilizing the effect of the combined use.

[0012]

【Example】

[0013]

Example 1 Using a flatbed type ink jet printer (1) A silk cloth was placed on a board on a printing stand, alkali glue was printed on a screen, and then dried. (2) The board was moved and printed with an inkjet printer. (3) The plate was moved to a printing stand, and an alkaline paste was printed on a screen. (4) It was moved to a shelf and left for 60 minutes to fix it. (5) Washing and neutralization were followed by soaping. As a result of dyeing the silk cloth in the above steps, a silk dyed article having high sharpness, color developing property and high concentration was obtained.

[0014]

Example 2 Use of Flatbed Inkjet Printer (1) A plate was placed inside a T-shirt dyed in a light color. (2) An alkaline paste was printed on a part of the chest of the T-shirt on a printing stand with a screen and then dried. (3) Moved to the inkjet printer. (4) The portion where the alkali paste was adhered was printed with an ink jet printer. (5) Alkaline paste was printed on the printing area on the printing stand with a screen. (6) It was moved to a shelf and left for 120 minutes to perform fixing. (7) After washing with water and neutralization, soaping was performed. Inkjet print dyeing was performed on a light-colored cotton T-shirt by the method of printing an alkali paste only on the above-mentioned printed portion.

[0015]

Example 3 Using a flatbed type ink jet printer (1) A cotton cloth was printed with an ink jet printer. (2) An alkali paste was printed on the printing portion on a printing stand with a screen. (3) It was moved to a shelf and left for 120 minutes to fix it. (4) After washing with water and neutralization, soaping was performed. Since the fabric was less bleeding, it was directly printed without any pretreatment. Compared to those printed with alkali glue before and after printing, the prints are inferior in sharpness, color development and density, but can be used alone.

[0016]

Example 4 Use of Flatbed Type Inkjet Printer (1) After fully stretching a cotton knit with irregularities on a printing stand, stretching it onto a board and attaching alkali glue with a sprayer equipped with a compressor,
Let dry. (2) The board was moved and printed with an inkjet printer. (2) The whole plate was moved to a printing stand, and an alkali paste was applied by a sprayer with a compressor. (4) It was moved to a shelf and left for 60 minutes to fix it. (5) Washing and neutralization were followed by soaping. As a result of dyeing the cotton knit in the above steps, a dyed product of the cotton knit having high sharpness, color development, and density was obtained.

[0017]

As the equipment for carrying out the process of the present invention, a simple printing stand for printing an alkaline paste, a screen, a squeegee and a sprayer are required, but these can be installed at low cost and have the following advantages. to be born. (1) Since the pre-treatment and steam heat treatment equipment are unnecessary, the installation area is small, and the initial investment can be greatly reduced. (2) Processing of sewn products, piece objects, and fabrics having a three-dimensional appearance is facilitated, and processing objects are greatly expanded. (3) Since only the required amount can be processed, it is possible to cope with extremely small lots that are not suitable for outsourcing. (4) Pretreatment and fixation can be performed only on the printed part. (5) The productivity is improved by the combined use with other dyeing. (6) The entire dyeing process can be performed in a small factory,
Easy product management. (7) The running cost can be greatly reduced.

Claims (3)

[Claims] (1) An alkaline paste is adhered to a fabric and dried. (2) Print with an inkjet printer. (3) Attach the alkaline paste to the printing section. (4) Leave at room temperature for 10 minutes or more (fixing time). (5) Perform soaping. Method of dyeing in the above steps 2. The method according to claim 1, wherein the method of attaching the alkaline paste is screen printing. 3. The method according to claim 1, wherein the method of attaching the alkaline paste is spraying.